Agree, but surely 'move your head' is a typing error. Instrument scan should be eye movements only whether radial or orbital, head moves can start vestibular canal upsets; the occasional glance over to Ts & Ps on a large cockpit panel should be the only conscious head movement.
You could do that on a Gazelle but the Wessex, Lynx and Sea King all required some head movement to scan the instruments, especially if you were on standbys.